Both the 396T and 396XT are basically the same so I dont see using the Uniden 396T home and pictured car adapter would be a problem. They probably just didnt update the XT to the picture.
This one here is the one I found and I assume it will work out Ok it states for the 396T and hope it will Work for my 396xt I found one at Universal Radio and Scanner Master) the one at Scanner master had a Comment that followed below stating that the regulator went bad and the Scanner had to be sent in.. That kind of made the eyebrows rise up but hopefully that is a one in only Case
If i get one I would probably go with Uniden or Universal as they have a Great sales Staff and when product was sent to me it was done in a fairly short Time...